1) Grasp mentally; understand.
2) Include, comprise, or encompass.
Comprehend and understand are very often interchangeable. In fact,
both words mean "grasp the meaning of," but in some cases understand
stresses the final result, while comprehend stresses the process of
From L. comprehendere "to take together, to unite; include; seize,"
from → com- "together, with," +
prehendere "to seize," → prehend.